Thought you guys should see this link (top item)

I have been using one of these tailpies for some time, i can tell you they do what they say!
More thrust in the model than out, and the engine runs cooler.
They now do them for larger engines than the 44 and 54.

http://www.wren-turbines.com/news.htm

Hi,

Do you have any price info?

The web site quotes 110 and 130 British pounds, depending on their standard sizing. It also says they will quote custom work.

Tom

Hi yes indeed they work! if the Bee was able to produce aditional .8 % RCJI last issue. do the Math with the 14 lbs the Super Bee and you can power RELIABLE a 20 lb Jet with a 1.4 lb motor and not have all that extra fuel ,we used the same desighn in are short pipes on the twin bee F-15 @ Florida Jets we didnt have the bellmouths on the pipes wich add even more power great pipes, Tam can custom make them here in the usa Paul AJUSA